Wireless transmit phone call from Bluetooth mobile phone to the car FM stereo system. Built-in FM transmitter, full frequency: 87.5-108.0MHZ. With built-in microphone and automatically calling-number system Supports USB disk and SD card With 3.5mm line-in jack, support external audio devices. Switch to Hands-free mode automatically from music playing status when receiving calls Dual USB charging port for charging iPod/ iPhone, iPad and other mobile device. Support 12-24V voltage from the car cigarette lighter. Strong and elegant design with LCD screen display, just support number displaying. Specifications: Bluetooth version: V3.0+EDR Voltage: 12~24V Working current: 45mA(max) Standby current: 25mA(max) Effective distance: 5m FM Frequency: 87.5-108.0MHz Transmitted power: 87 dBuv/107dBuv Size:90*80*40MM Color:Black Package Included: 1 x Car Bluetooth Kit Music Player